Barrel length quwstion?

Wookie316

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Jul 13, 2009
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I know longer barrels add to your FPS.

My question is 2 parts.

1. How many FPS per inch do you loose on average?

2. How does barrel length affect max load pressure? Does a longer barrel with the same load have higher pressure or is it affected?
 

Ernie

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Some it depends on the cartridge you are shooting as well.
I have seen as much as 40 fps per inch.
 

Leathel

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Sep 3, 2009
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What Cal?? smaller cal less diference the longer it is......Over bore cals need longer and will gain more per inch

Saw an article on 6mmBR that tested between 28-33 inch and past 28" the average was around 8fps.....but they didn't test shorter unfortunatly
 

Wookie316

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Dad's 7mm is 24 1/2" long & my 264 Win Mag is just over 26". You wouldn't think the extra 1 1/2 would be much of an issue in the field, but I find it somewhat clumsy & awkward compared to Dad's 7mm, especially going through light bush.

1 1/2" shorter on a 264 Win Mag shouldn't make much difference?
 
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Long Time Long Ranger

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Depends on several factors. Big overbore small caliber magnums can gain quite a bit with barrel length. Short efficient cartridges like the 6mm BR gain very little. For example my 257 and 264 STW's have gained as much as a 100 fps going from 26" to 28" of barrel length. My big 338's including the Lapua, 338-378 wby, 338 ulttramag and 338-300 ultramag average about 20 fps per inch. Powders and primers also affect barrel length velocity. Sometimes with a faster powder and hot primer to get all the burn quick as possible you can overcome some of the velocity loss in a shorter barrel. Lots of factors and there is no set velocity gain per inch of barrel. It will differ with each cartridge or class of cartridges.
 

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